Land Rover Repair: Oxygen Sensors, oxygen sensors, oxygen sensor

Question
I recently put my 03 Disco in the shop because the engine light was coming
on. The cause was that my oxygen sensor in Bank 1 was unplugged, but a
few days later the light came back on and I suspect/hope that the plug just
came unplugged again. Id rather not put it in the shop just to pay someone
to plug in back in but I don't know where this is located and cant find any
diagrams on it. Could you point me in the right direction?

Answer
It is highly unlikely that the plug has come off again.  There are 4 sensors in all, 2 in each bank.  Bank 1 is on the left side of the car.  The downstream sensor is above the transfer box and the upstream is quite hard to get to.  It is on the left hand side of the transmission.

I would suggest you buy a generic scanner and check the code as plugging a sensor back in will not cancel the light.